WTF, HTML and CSS?

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Fluidity
HTML Purifier - Filter your HTML the standards-compliant way!
Ridiculously Responsive Social Sharing Buttons by KNI Labs
Ridiculously Responsive Social Sharing Buttons
Making Forms Fabulous with HTML5 - HTML5 Rocks
Image Lightbox, Responsive and Touch‑friendly — Osvaldas Valutis
Monitor progress of long running php scripts with html5 server sent events
URL Metrics
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PHP Master | Migrate from the MySQL Extension to PDO
Sooshi
How to Enable Tags in WordPress Pages - SitePoint
Tiff - a visual typeface diff tool.
A type diff tool that visually contrasts the differences between two fonts.
Snazzy Maps - Free Styles for Google Maps
Gratisography: Free, use as you please, high-resolution pictures.
Type Scale - A Visual Calculator
Pair networks: backup your data
Social Count
Creative Review - The Independent redesigns
Why moving elements with translate() is better than pos:abs top/left - Paul Irish
HTTP Archive
Ideal line length in ems | Max Design
csste.st
Aaron Allport | Freelance web developer from Colchester, UK.
Powerful WordPress Tips And Tricks
The HTML5 Scorecard: The Good, The Bad and the Ugly in iOS 7 | Blog | Sencha
Quick Tip: How to Target IE6, IE7, and IE8 Uniquely with 4 Characters | Nettuts+
A reminder of IE8/IE7/IE6 hacks
How to Check For an LG Display in a MacBook Air and Make it Look Better
Color calibration MacBook Air
Responsive Nav — Responsive Navigation Plugin
Fast and lean
Favicon Cheatsheet
Barley: The web editor for everyone.
An alternative to Squarespace